Blue stragglers are so named because they seemingly lag behind in the aging process, appearing younger than the population from which they formed.

蓝色的散兵游勇是这样命名是因为他们似乎落后在衰老的过程，出现以下的人口，他们从那里形成。

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And with the process of population aging was speed up in rural area. The fluctuating of mortality was influenced by demographic and non-demographic factors in common.

农村地区人口老化程度加快，人口因素与非人口因素共同影响死亡率的变化。

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To the end of 2010, China's aging population will reach about 20% of the total population, the aging process in China in terms of growth rate and proportion of the world more than the aging process.

至2010年年底，中国老龄人口将达到总人口的20%左右，中国老龄化进程无论从增长速度和比重都超过了世界老龄化进程。

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